Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
One adiabatic, one isobaric and two constant volumes
Two adiabatic, one isobaric and one constant volume
One adiabatic, two isobaric, and one constant volume

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Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Decrease continuously
Increase first at slow rate and then fast
Increase first at fast rate and then slow
First increase, reach maximum and then decrease

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